I'm assuming the herd didn't ford the Hudson. Shame if they did and no one filmed it.
"It started the day before at GEM Farm in Castleton, when a herd of what are formally named American bison got loose and their owners were unable to round them up. On Thursday night, police said, 15 swam the river from around Schodack Island, came ashore in Bethlehem and headed into an area at the end of Peltz Road."
Amazing!